Highlights from the Twenty First Episode of Season 2 of Elementary

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan.

Season 2 Episode 21 - Elementary - CBS.com

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Joan goes inside the world of unmanned aeronautics in "The man With The Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Mycroft makes a surprise visit in "The Man With The Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Joan and Sherlock take on a missing person case in 'The Man With The Twisted Lip' S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Sherlock investigates a missing person case in "The Man With The Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Detective Bell in "The Man With The Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Mycroft's visits NY in "The Man With Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Rhys Ifans returns as Mycroft Holmes in "The Man With The Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Mycroft and Joan chat in "The Man With The Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Joan Watson in "The Man With The Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Sherlock in "The Man With The Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Joan and Sherlock go inside the world of unmanned aeronautics in "The Man With The Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.

Sherlock and Watson in "The Man With The Twisted Lip" S2E21

When Sherlock’s brother Mycroft makes a surprise return to New York, his motivations cause discord between Sherlock and Joan. Meanwhile, a missing person case takes Sherlock and Joan inside the world of unmanned aeronautics.